From 1001b94efc88e2cc61801575632371d6c30b51f7 Mon Sep 17 00:00:00 2001 From: chenyabin <3497422417@qq.com> Date: Thu, 23 May 2024 20:13:16 +0800 Subject: [PATCH 1/3] =?UTF-8?q?feat:=E4=BF=AE=E6=94=B9=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../Main.java" | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git "a/work/com/java/minxi/java_20240418/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" "b/work/com/java/minxi/java_20240418/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" index 103a422..e8d0c8f 100644 --- "a/work/com/java/minxi/java_20240418/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" +++ "b/work/com/java/minxi/java_20240418/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" @@ -23,8 +23,6 @@ public class Main { student3.sex = "女"; student3.sleeping(); - System.out.println("对象1"+student1); - System.out.println("对象2"+student2); - System.out.println("对象3"+student3); + } } -- Gitee From 897f90ef401505fa83edfccce390ee73fc4e175f Mon Sep 17 00:00:00 2001 From: chenyabin <3497422417@qq.com> Date: Tue, 28 May 2024 20:32:17 +0800 Subject: [PATCH 2/3] =?UTF-8?q?feat:=E6=8F=90=E4=BA=A4=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../Main.java" | 77 +++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 "work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" diff --git "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" new file mode 100644 index 0000000..5a46dcc --- /dev/null +++ "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" @@ -0,0 +1,77 @@ +package com.java.minxi.java_20240524.java_2302_陈雅宾_2344310213; + +import java.sql.Connection; +import java.sql.DriverManager; +import java.sql.ResultSet; +import java.sql.Statement; +import java.util.ArrayList; +import java.util.List; + +public class Main { + public static void main(String[] args) { + bdDemo(); + bdDemo2(); + } + + public static void bdDemo(){ + Connection connection = null; + Statement statement = null; + try{ + Class.forName("com.mysql.cj.jdbc.Driver"); + String URL = "jdbc:mysql://localhost:3306/student?serverTimezone=Asia/Shanghai"; + String username = "root"; + String password = "123456"; + connection = DriverManager.getConnection(URL,username,password); + // 查询所有用户的信息; + + // 查询id为1，且年龄为35岁的用户信息； + // 把id为3的用户名称修改为小严； + String sql3 = "update teacher_info set teacher_name = '小严' where id = 3"; + statement = connection.createStatement(); + int rs = statement.executeUpdate(sql3); + if (rs > 0){ + System.out.println("执行成功"); + }else { + System.out.println("执行失败"); + } + }catch (Exception e){ + e.printStackTrace(); + }finally { + try { + statement.close(); + connection.close(); + }catch (Exception e){ + e.printStackTrace(); + } + } + } + public static void bdDemo2() { + Connection connection = null; + Statement statement1 = null; + try{ + Class.forName("com.mysql.cj.jdbc.Driver"); + String URL = "jdbc:mysql://localhost:3306/student?serverTimezone=Asia/Shanghai"; + String username = "root"; + String password = "123456"; + connection = DriverManager.getConnection(URL,username,password); + // 查询所有用户的信息; + String sql = "select id,teacher_name,teacher_age from teacher_info"; + statement1 = connection.createStatement(); + ResultSet resultSet = statement1.executeQuery(sql); + while (resultSet.next()){ + int id = resultSet.getInt("id"); + String name = resultSet.getString("teacher_name"); + int teacher_age = 0; + int age = resultSet.getInt(teacher_age); + System.out.println(id); + System.out.println(name); + System.out.println(age); + } + resultSet.close(); + statement1.close(); + connection.close(); + }catch (Exception e){ + e.printStackTrace(); + } + } +} -- Gitee From bc908fa076301075d2ead6045dc04f38149da5f8 Mon Sep 17 00:00:00 2001 From: chenyabin <3497422417@qq.com> Date: Tue, 28 May 2024 20:36:35 +0800 Subject: [PATCH 3/3] =?UTF-8?q?feat:=E4=BF=AE=E6=94=B9=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../Main.java" | 32 +++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" index 5a46dcc..bad5cba 100644 --- "a/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" +++ "b/work/com/java/minxi/java_20240524/java_2302_\351\231\210\351\233\205\345\256\276_2344310213/Main.java" @@ -11,6 +11,7 @@ public class Main { public static void main(String[] args) { bdDemo(); bdDemo2(); + bdDemo3(); } public static void bdDemo(){ @@ -61,8 +62,7 @@ public class Main { while (resultSet.next()){ int id = resultSet.getInt("id"); String name = resultSet.getString("teacher_name"); - int teacher_age = 0; - int age = resultSet.getInt(teacher_age); + String age = resultSet.getString("teacher_age"); System.out.println(id); System.out.println(name); System.out.println(age); @@ -74,4 +74,32 @@ public class Main { e.printStackTrace(); } } + public static void bdDemo3() { + Connection connection = null; + Statement statement2 = null; + try{ + Class.forName("com.mysql.cj.jdbc.Driver"); + String URL = "jdbc:mysql://localhost:3306/student?serverTimezone=Asia/Shanghai"; + String username = "root"; + String password = "123456"; + connection = DriverManager.getConnection(URL,username,password); + // 查询所有用户的信息; + String sql = "select id,teacher_name,teacher_age from teacher_info where id = 1 and teacher_age = 35"; + statement2 = connection.createStatement(); + ResultSet resultSet = statement2.executeQuery(sql); + while (resultSet.next()){ + int id = resultSet.getInt("id"); + String name = resultSet.getString("teacher_name"); + String age = resultSet.getString("teacher_age"); + System.out.println(id); + System.out.println(name); + System.out.println(age); + } + resultSet.close(); + statement2.close(); + connection.close(); + }catch (Exception e){ + e.printStackTrace(); + } + } } -- Gitee